Florida police said on Wednesday they arrested a 17-year-old who had material to make pipe bombs at his home and had planned to attack and cause mass casualties at the Tampa high school that had expelled him.

A decade after the 9/11 attacks, a “lone wolf terrorist” like the shooter in Norway now presents a bigger risk to the United States than a large-scale operation, President Barack Obama said on Tuesday.

The following Witness piece recalls how the hardline communist coup against Soviet leader Mikhail Gorbachev unfolded in August 1991. Steve Gutterman is currently based in Moscow for Reuters and was working as an assistant for a U.S. newspaper in the Russian capital at the time of the coup.

The United States must ease Beijing’s worries about its vast U.S. debt holdings, China’s media said on Wednesday, marking a visit by Vice President Joe Biden, who said his hosts should not fret about their dollars or assume American power is waning.

Libyan rebels launched an assault on an oil refinery on Wednesday to drive the last remaining troops loyal to Muammar Gaddafi out of a city on Tripoli’s outskirts and consolidate a siege of the capital.